Wavelength dependence of laser plasma interaction related to shock ignition approach

Year: 2018

Authors: Pisarczyk T., Gus\’Kov S.Y., Dudzak R., Renner O., Batani D., Chodukowski T., Rusiniak Z., Dostal J., Demchenko N.N., Rosinski M., Parys P., Smid M., Korneev P., Krousky E., Borodziuk S., Badziak J., Antonelli L., Gizzi L., Cristoforetti G., Koester P., Maheut Y., Volpe L., Baffigi F., Levato T., Skala J., Zaras-Szydlowska A., Trela J., Mancelli D., Ullschmied J., Pfeifer M., Juha L., Krus M., Hrebicek J., Medrik T., Jungwirth K., Krupka M., Pisarczyk P.

Autors Affiliation: Institute of Plasma Physics and Laser Microfusion, Warsaw, 01-497, Poland; P. N. Lebedev Physical Institute of RAS, Moscow, 119991, Russian Federation; National Research Nuclear University MEPhI, Moscow, 115409, Russian Federation; Institute of Physics, Czech Academy of Sciences, Prague, 182 21, Czech Republic; Institute of Plasma Physics, Czech Academy of Sciences, Prague, 182 00, Czech Republic; Universite Bordeaux, CNRS, CEA, CELIA, Talence, France; Universita di Roma la Sapienza, Rome, Italy; York Plasma Institute, University of York, York, United Kingdom; Warsaw University of Technology, ICS, Warsaw, 00-661, Poland

Abstract: This paper provides a summary of recent research connected with the shock ignition (SI) concept of the inertial confinement fusion which was carried out at PALS. In the experiments, Cu planar targets coated with a thin CH layer were used. Two-beam irradiation experiment was applied to investigate the effect of preliminary produced plasma to shock-wave generation. The 1? or 3? main beam with a high intensity >1015 W/cm2 generates shock wave, while the other 1? beam with the intensity below 1014 W/cm2 creates CH pre-plasma simulating the pre-compressed plasma related to SI. Influence of laser wavelength on absorbed energy transfer to shock wave was studied by means of femtosecond interferometry and measuring the crater volume. To characterize the hot electron and ion emission, two-dimensional (2D) Ka-imaging of Cu plasma and grid collector measurements were used. In single 1? beam experiments energy transport by fast electrons produced by resonant absorption made a significant contribution to shock-wave pressure. However, two-beam experiments with 1? main beam show that the pre-plasma is strongly degrading the scalelength which leads to decreasing the fast electron energy contribution to shock pressure. In both the single 3? beam experiments and the two-beam experiments with the 3? main beam, do not show any clear influence of fast electron transport on shock-wave pressure. The non-monotonic behavior of the scalelength at changing the laser beam focal radius in both presence and absence of pre-plasma reflects the competition of plasma motion and electron heat conduction under the conditions of one-dimensional and 2D plasma expansion at large and small focal radii, respectively. Copyright


Volume: 36 (3)      Pages from: 405  to: 426

KeyWords: Electron energy levels; Electron transport properties; Energy transfer; Heat conduction; Inertial confinement fusion; Interferometry; Laser beams; Laser fusion; Laser produced plasmas; Plasma shock waves; Shock waves, Absorption mechanisms; Fast electrons; Femtoseconds; Inertial fusion; Resonant absorption; Shock ignitions, Beam plasma interactions
DOI: 10.1017/S0263034618000447

Citations: 4
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